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BLUESIL RTV 3255 + Cat. XY-86 1.1kg

BLUESIL RTV 3255 + Cat. XY-86 1.1kg

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BLUESIL® RTV 3255 + Cat. XY-86 – Two-component silicone rubber for high-precision, robust molds with medium hardness

High-hardness (Shore A 55), high-temperature resistant 2K sn silicone — specifically for shoe sole manufacturing and technical mold tools

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  • brand
  • Manufacturer
  • Networking type
  • Container
  • Number of components
  • consistency
  • Mixing ratio
  • UV resistance
  • Paint has hardened
  • Self-leveling
  • Density (g/cm³)
  • Viscosity uncrosslinked (mPa·s)
  • Electrical insulation
  • Potting time (min)
  • Demolding time (min)
  • Food contact
  • Suitable for medical use
  • Tensile strength (MPa)
  • Elongation at break (%)
  • Tensile strength (N/mm)

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Red Tin Mold Making Silicone BLUESIL 2K Silicone ELKEM Industrial Swiss Bearing RTV Complete Kit Hard Condensation RTV 3255 Shore A 55 Shoe Soles Technical Molds Thermal Post-Curing

 
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. Express logistics. Fast and reliable within Switzerland & Europe.

Shipping from Swiss warehouse within 24 hours. Batch certificate. Invoice within 30 days (B2B). Technical support.
Shipping & Delivery

Usually 1 to 3 working days

Availability will be confirmed after order receipt.

Express logistics within Switzerland & Europe.

General Terms and Conditions →

Product data

Internal reference: 40-931.PG

HS code: 39100000

Internal reference: 40-931.PG
HS code: 39100000

BLUESIL RTV 3255 + Cat. XY-86 1.1kg
BLUESIL RTV 3255 + Cat. XY-86 1.1kg
Bluesil Elkem Silicones SKU 40-931.PG​

Bluesil RTV 3255 is a high-hardness (Shore A 55), high-temperature resistant 2K sn silicone — specifically for shoe sole manufacturing and technical mold tools.

This product line comprises 2K polycondensation silicone elastomers (tin-catalyzed) for mold making — established, economical industrial chemistry with good substrate compatibility, especially for lost-wax casting, decoration, and construction. RTV 3255 is tailored to specific industrial applications — the most important properties and areas of application are listed below.

Shoe sole specialist

Bluesil RTV 3255 is designed for the production of highly flexible molds for shoe soles and technical components. It features high hardness (Shore A 55) and very good high-temperature resistance—at 300 °C for two weeks, the material achieves Shore A 90 and a tensile strength of 5 MPa.

RTV 3255 in numbers
Shore A 55
extremely hard
+300 °C
High temp.
Red
Color
SN-Cure
condensation

What makes the RTV 3255 stand out

High-temperature resistant
At 300 °C for 2 weeks, the vulcanizate achieves Shore A 90 and a tensile strength of 5 MPa.
High hardness (Shore A 55)
Stable shape for shoe soles and technical components.
High tensile strength
4 kN/m tensile strength — robust even under high pressure.
Fully connected under all conditions
Unlike other Sn-Cure systems, this one provides complete curing.
With CATA XY 86 NL
Odorless catalyst for a more pleasant workplace.
Viscosity adjustable
Bluesil H47V50 allows the viscosity to be reduced without loss of mechanical properties.

What is the RTV 3255 used for?

Shoe sole shapes
Highly flexible molds for shoe sole reproduction.
Technical components
Molds for highly stressed technical workpieces.
High-temperature applications
Forming tools in temperature-critical processes.
Industrial reproduction
Reusable molds for industrial prototypes.
Low-melting metals
Mold for casting tin, zinc and low-melting alloys.
Composite materials
Reproduction of polyester and epoxy components.
Data sheets & safety data sheet
Full TDS and SDS in DE, EN, FR — view or download directly.
To the documents →

processing

1
Stir up the RTV base
Homogenize thoroughly before use — fillers may sediment.
2
Mix with catalyst
100 parts RTV + 5 parts Bluesil CATA (24H Standard / 6H Quick / SPE for PE resistance). Mix thoroughly — no streaks visible.
3
Degas
30–50 mbar vacuum — mixture expands 3–4 times. Break the vacuum 2–3 times.
4
Shed
Pour slowly from the lowest point of the mold.
5
Network
At 23 °C / 50% relative humidity for 24 hours for standard workflow. Higher temperature and humidity accelerate crosslinking.
6
demolding
Demold after demolding time (standard 24 h, quick 6 h). Linear shrinkage typically 0.4–0.7% — take this into account if dimensional accuracy is required.

Recommended accessories

Bluesil CATA 24 H
Standard tin catalyst (24 h demolding time) for the Bluesil RTV condensation series.
View product →
Bluesil Catalyseur 6 H
Fast Sn catalyst (6 h demolding) for high-throughput workflows.
View product →
Bluesil Additive PC Thixo
Thixotropy additive for Bluesil RTV 3325 (polycondensation) — vertical application.
View product →
Bluesil Diluant 2030
Low viscosity thinner for Bluesil RTV mixture viscosity adjustment.
View product →

Important instructions

Mixing & Dosage
Stir A and B thoroughly before each use. Use precise dosage in the specified ratio (see table above) — ideally by weight. Incorrect dosage will result in incomplete cross-linking.
Degassing
Degas the mixture under a vacuum of 30–50 mbar. The material expands 3–4 times, then contracts back to its original size after 5–10 minutes. Interrupt the vacuum several times for better degassing.
Avoid inhibitors
Polyaddition silicones are inhibited by: sulfur-vulcanized rubber, tin-catalyzed RTV, amine epoxides, and PVC with tin salts. If in doubt, conduct a preliminary test.
Application advice
SILITECH will advise you on the optimal RTV variant for your application — substrate, hardness, pot life, mechanics. Contact us with your specific application details.

RTV 3255 compared to related RTV products

Networking system, mechanics, and processing times side by side — all values ​​from the official Elkem TDS. “— " = not specified in the datasheet.

RTV 3255
Current product		 RTV 3325 →RTV 3318 SPU →Calsil PC 30 →
Networking system2K Condensation (Sn)2K Condensation (Sn)2K Condensation (Sn)2K Condensation (Sn)
Mixing ratio100 : 4 (Cata)100 : 5 (Cata)100 : 5 (CATA SPU)with CATA
ColorRedWhiteWhite—
Shore A hardnessA 55A 25–28A 18A 30
Elongation at break100 %440–490 %520 %—
Tensile strength0.8 MPa4–4.3 MPa3.3 MPa—
Tear resistance4 kN/m21–26 kN/m19 kN/m—
Potting time3 h90–150 min (hr)90–150 min—
demolding time24 h24 h (Standard) / 6 h (Fast)24 h—
Mixed viscosity30,000 mPa·s35,000 mPa·s25,000 mPa·s—
Main applicationShoe sole shapeslost-wax moldsPolyurethane casting resin moldsModel making molds
Topics & Application Areas
Key terms related to this product. Also useful for our search and filters.
Red Tin Mold Making Silicone BLUESIL 2K Silicone ELKEM Industrial Swiss Bearing RTV Complete Kit Hard Condensation RTV 3255 Shore A 55 Shoe Soles Technical Molds Thermal Post-Curing

Technical data for BLUESIL RTV 3255 + Cat. XY-86 1.1 kg

All 20 product information 7 Further properties 1 Physical properties 4 Electrical properties 1 Curing values ​​2 Product approvals 2 Mechanical properties 3
Product information
brand Bluesil
Manufacturer Elkem Silicones
Networking type Condensation (tin)
Container 1.1 kg
Number of components 2K (two-component)
consistency Flowable
Mixing ratio 100:4
Other features
UV resistance No
Physical properties
Paint has hardened Red
Self-leveling Yes
Density (g/cm³) 1.5
Viscosity uncrosslinked (mPa·s) 30
Electrical properties
Electrical insulation No
Curing values
Potting time (min) 3
Demolding time (min) 24
Product approvals
Food contact No
Suitable for medical use No
Mechanical properties
Tensile strength (MPa) 0.8
Elongation at break (%) 100
Tensile strength (N/mm) 4

For binding values, please refer to the technical data sheet (TDS) in the "Documents" tab.

Documents and datasheets

Click on a document for a preview or the download icon for a direct download.

Technical Data Sheets (TDS) 2
Bluesil RTV 3255 + Cat. XY-86 1.1 KG - Technical Data Sheet EN.pdf
537 KB
Bluesil RTV 3255 + Cat. XY-86 1.1 KG - Fiche Technique FR.pdf
92 KB

Frequently asked questions about RTV 3255

Practical questions regarding processing and design — answered by SILITECH.

Bluesil RTV 3255: High-hardness (Shore A 55), high-temperature resistant 2K tin silicone — specifically for shoe sole manufacturing and technical mold tools. Main applications include shoe sole molds, technical components, and high-temperature applications.

Polycondensation crosslinking is a two-component silicone chemistry using a tin catalyst. Upon mixing, the components crosslink, releasing alcohol as a byproduct—this can lead to a small linear shrinkage (typically <0.7%). Advantages: Polycondensation silicones are less sensitive to inhibitors than polyaddition systems—they crosslink even in contact with sulfur-vulcanized rubber and are tolerant of many substrates. It is an established, economical industry standard for lost-wax casting, decorative reproduction, and construction.

Thoroughly stir components A and B before each processing step. Measure precisely according to the mixing ratio specified in the TDS (see comparison table above) – ideally by weight. Mix with an electric or pneumatic agitator at low speed (minimize air entrainment). Degas the mixture under vacuum (30–50 mbar) – the material will expand 3–4 times its original volume, bubbles will escape, and the material will settle back after 5–10 minutes. Then slowly pour into the mold from the lowest point to avoid air entrapment. For polyaddition systems, avoid contact with inhibitors (sulfur-based rubber, tin-based RTV, amine epoxides, PVC with tin salts).

Store in the unopened original container in a dry, cool place — typically between +5 and +30 °C, see TDS for exact values. Store components A and B separately; seal airtight after opening. Polyaddition systems are insensitive to moisture, but should be stored in a cool place to maintain pot life. Consult the Safety Data Sheet (SDS) before use.

The comparison table above lists related RTV products with different hardnesses, pot lives, or application profiles. If you are unsure which product is best for you, we would be happy to advise you — contact SILITECH with details of your application (substrate, desired hardness, processing time, mechanical requirements, and durability).

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Product specifications

Product information
brand Bluesil
Manufacturer Elkem Silicones
Networking type Condensation (tin)
Container 1.1 kg
Number of components 2K (two-component)
consistency Flowable
Mixing ratio 100:4
Other features
UV resistance No
Physical properties
Paint has hardened Red
Self-leveling Yes
Density (g/cm³) 1.5
Viscosity uncrosslinked (mPa·s) 30
Electrical properties
Electrical insulation No
Curing values
Potting time (min) 3
Demolding time (min) 24
Product approvals
Food contact No
Suitable for medical use No
Mechanical properties
Tensile strength (MPa) 0.8
Elongation at break (%) 100
Tensile strength (N/mm) 4
Keywords
Keywords
Red Tin Mold Making Silicone BLUESIL 2K Silicone ELKEM Industrial Swiss Bearing RTV Complete Kit Hard Condensation RTV 3255 Shore A 55 Shoe Soles Technical Molds Thermal Post-Curing
Mechanical properties
Shore hardness A55.0 Shore A
Tensile strength0.8 MPa
Elongation at break100.0 %
Tear resistance4.0 kN/m
processing
Viscosity Comp. A30,000 mPa·s
Pot life at 23°C180.0 min
demolding time1440.0 min
Physical & Thermal
Density (23°C)1.5 g/cm³
Temperature resistance (duration)-50 to 300 °C
Peak temperature (short-term)300 °C
storage
Shelf life in original packaging12 months
Storage temperature-5 to 30 °C

Documents and datasheets

Safety Data Sheets (SDS) and Technical Data Sheets (TDS) are available for download: